blog: add /bw-plan command (new in buildwright 0.0.9)

chore: update vendored buildwright skill 0.0.5 → 0.0.9

docs: eliminate README duplication, add claw workflow walkthrough

blog: clean up language for Substack publication

refactor: rename team-directory to example, rewrite root README

fix: add department field to schema, seed, and docs

fix: add department column migration and fix get() query consistency

Initial commit: Claw Architecture with OpenClaw and Buildwright